Based on ecological environmental protection is with planting tree foundation ditch processing apparatus
Technical Field
The invention relates to the technical field of environmental protection, in particular to a tree planting foundation pit treatment device based on ecological environmental protection.
Background
The environmental protection is also called ecological environment protection, is a protective measure based on harmony between human and nature as a core, and when the ecological environment is protected, the most common mode can be used for protecting the environment by adopting a mode of afforestation besides treating atmosphere, water flow and the like, so that the tightness of an ecological circle and the high efficiency of natural purification are enhanced.
In the operation of carrying out the afforestation, need open the hole and overturn earth on your earth usually, the absorption rate of nutrient dispersion increase plant in the earth, and the foundation ditch earth processing mode that adopts usually now adopts the manual work to handle earth usually, and earth itself after the manual work is the cubic relatively and arranges, can't make earth carry out the intensive dispersion, for this reason, we have proposed one kind based on ecological environmental protection with planting tree foundation ditch processing apparatus.
Disclosure of Invention
The invention aims to provide a tree planting foundation pit treatment device based on ecological environment protection, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a tree planting foundation pit treatment device based on ecological environmental protection comprises an equipment box, wherein the equipment box is rectangular box-shaped, the inside of the equipment box is hollow, supporting legs are fixedly mounted at the front end and the rear end of the left side and the rear end of the bottom wall surface of the equipment box, the supporting legs are rectangular columnar, a drill cone is arranged at the bottom of the equipment box and is cone-shaped, two groups of limiting plates are fixedly mounted at the left end and the right end of the top of the drill cone and at the front end and the rear end of the drill cone, the limiting plates are rectangular plate-shaped, an auxiliary plate is arranged between the two groups of limiting plates at the corresponding positions and is trapezoid plate-shaped, the auxiliary plate is gradually widened from bottom to top, a driving plate is arranged at the left side of the rear end inside of the equipment box and is circular block-shaped, an adjusting auxiliary rod is obliquely arranged inside the driving plate, the two ends of the adjusting, the restriction axle piece is circular cubic, and the restriction axle piece is located the front side of driving-disc, and the position of restriction axle piece corresponds each other with the centre of a circle position of driving-disc, seted up the restriction axle slot on the lateral wall of regulation auxiliary rod, the restriction axle slot is circular form groove, the size of restriction axle slot and the big or small looks adaptation of restriction axle piece, the initiative groove has been seted up to the lateral wall rear end of regulation auxiliary rod, and the initiative groove is front and back both ends semicircular arc slotted hole, the left side wall edge fixed mounting of driving-disc has the initiative regulating block, and the initiative regulating block is circular cubic, and the size of initiative regulating block and the inboard big or small looks adaptation in initiative groove, and the inside in initiative groove is taken turns to the buckle on adjusting auxiliary rod in the initiative regulating block activity.
Preferably, the driven groove has been seted up to the lateral wall front end of adjusting auxiliary rod, and both ends semicircular arc slotted hole around the driven groove is, main restriction groove has all been seted up to the inboard left and right sides wall face intermediate position of equipment case, and main restriction groove is the rectangle slotted hole, all seted up two sets of assistance restriction grooves on the inboard left and right sides wall face of equipment case, assist the restriction groove and be the rectangle slotted hole, two sets of assistance restriction grooves on the same lateral wall of equipment incasement portion use main restriction groove to arrange as the mutual mirror image of center respectively.
Preferably, a lifting base plate is arranged at the middle position in the equipment box, the lifting base plate is rectangular block-shaped, the position of the lifting base plate corresponds to the positions of the main limiting groove and the auxiliary limiting groove, auxiliary limiting columns are fixedly mounted at the front end and the rear end of the left side wall surface and the rear end of the right side wall surface of the lifting base plate, the auxiliary limiting columns are cylindrical block-shaped, and the positions of the auxiliary limiting columns correspond to the positions of the auxiliary limiting grooves on the corresponding position wall surface of the inner side of the equipment box.
Preferably, a lifting groove is formed in the wall surface of the bottom of the equipment box, the lifting groove is a rectangular groove hole, the position of the lifting groove corresponds to the position of the lifting base plate, a driving motor is fixedly mounted at the bottom of the lifting base plate, an output shaft of the driving motor is fixedly provided with a driving shaft, the driving shaft is in a circular column shape, a movable groove is formed in the center of the side wall of the lifting base plate, the movable groove is a cylindrical groove hole, and the position of the movable groove corresponds to the position of the main limiting groove.
Preferably, fixed mounting has the restriction bearing on the inboard corresponding position wall of activity groove on the lift base plate, fixed mounting has main restriction post on the inner circle inner wall face of restriction bearing, the size of main restriction post and the big or small looks adaptation of main restriction groove and slave slot, and the right-hand member of main restriction post extends to the inside in corresponding position main restriction groove on the inboard right side wall of equipment box, and the left end of main restriction post extends to the inside in corresponding position main restriction groove on the inboard left side wall of equipment box through the slave slot on the regulation auxiliary rod.
Preferably, the right side area of the inner rear end of the equipment box is provided with an auxiliary motor, an auxiliary driving shaft is fixedly mounted on an output shaft of the auxiliary motor and is in a circular column shape, one end, far away from the auxiliary motor, of the auxiliary driving shaft is fixedly mounted on the wall surface of the corresponding position of the driving disc, a limiting base block is fixedly mounted on the wall surface of the top of the drill bit and is in a circular column shape.
Preferably, a telescopic rod is fixedly mounted at the top of the limiting base block, the bottom end of the driving shaft is fixedly mounted on the wall surface of the top of the telescopic rod, an adaptation groove is formed in the side wall of the auxiliary plate, the shape and size of the adaptation groove are adapted to the shape and size of the limiting base block, an adjustment limiting groove is formed in the top of the inner side of the auxiliary plate, the adjustment limiting groove is a circular groove hole, a limiting connecting sleeve rod is fixedly mounted on the side wall of the telescopic rod corresponding to the adjustment limiting groove, and the limiting connecting sleeve rod is cylindrical and rod-shaped.
Preferably, a sleeve is sleeved on the outer side wall of the limiting connection sleeve rod, one end, far away from the telescopic rod, of the sleeve penetrates through the wall surface of the corresponding position of the auxiliary plate and extends to the inside of the adjusting limiting groove, a secondary torsion spring is arranged inside the sleeve, the limiting connection sleeve rod is movably connected with the sleeve through the secondary torsion spring, a limiting clamping block is fixedly mounted on the side wall of one end, far away from the telescopic rod, of the sleeve, the limiting clamping block is in a circular ring block shape, and the size of the limiting clamping block is matched with the size of the inner side of the adjusting limiting.
Preferably, one end of the sleeve, which is far away from the limiting fixture block, is provided with a driven tooth, the outer side wall of the telescopic rod is sleeved with a movable sleeve, the movable sleeve is in a circular tubular shape, an auxiliary bearing is fixedly mounted on the inner side of the movable sleeve, an inner ring of the auxiliary bearing is fixedly mounted on the wall surface of the corresponding position on the outer side of the telescopic rod, a driving gear is fixedly mounted at the bottom of the movable sleeve, and the driving gear is meshed with the driven tooth on the sleeve at the corresponding position.
Preferably, the bottom of the side wall of the auxiliary plate is provided with a circular hole, a fixed shaft is fixedly mounted at the middle position of one side wall surface of each of two groups of limiting plates at corresponding positions, the middle positions of the side wall surfaces are close to each other, the fixed shaft is in a circular block shape, the size of the fixed shaft is matched with that of the circular hole on the side wall of the auxiliary plate, a main torsion spring is arranged on the inner side of the circular hole on the auxiliary plate, the fixed shaft is movably connected with the auxiliary plate through the main torsion spring, the top wall surface of the limiting clamping block is provided with an.
Preferably, the limiting clamping groove is formed in the position, corresponding to the extrusion groove in the limiting clamping block, of the top of the auxiliary plate, the limiting clamping groove penetrates through the wall surface of the top of the auxiliary plate and is communicated with the extrusion groove in the limiting clamping block, the limiting spring is fixedly mounted on the wall surface of the position, corresponding to the bottom of the extrusion groove, of the top of the limiting spring, the limiting ladder block is fixedly mounted at the top of the limiting spring, the limiting ladder block is in a trapezoid block shape, and the limiting ladder block is gradually widened from one end far away from the telescopic rod.
Compared with the prior art, the invention has the beneficial effects that:
(1) this be based on ecological environmental protection with planting tree foundation ditch processing apparatus, when the initiative drive shaft descends, through the rotatory extrusion of drill bit pointed end and oppression formula when the initiative drive shaft descends for in the drill bit takes the accessory plate to get into earth, when the accessory plate is not receiving the restriction, through the accessory plate over-and-under type rotation, adaptation groove on the cooperation accessory plate lateral wall makes earth overturn the breakage, thereby reaches earth in the foundation ditch and carries out abundant broken effect.
(2) This be based on ecological environmental protection with planting tree foundation ditch processing apparatus, one side of keeping away from the telescopic link when the accessory plate receives earth extrusion to make the accessory plate move through main torsional spring and the one end that the fixed axle is close to the telescopic link, when the accessory plate moves to the one end that is close to the initiative drive shaft, the inside restriction ladder piece of accessory plate is passed through the restriction spring and is contracted to the inside in extrusion groove by the extrusion, and simultaneously, carry out the reaction force through inferior torsional spring and make the sleeve pipe drive the restriction fixture block and rotate after the restriction ladder piece breaks away from with the restriction draw-in groove completely, thereby make restriction ladder piece and restriction draw-in groove misplace, the accessory plate is not receiving the restriction this moment, make the accessory plate carry out the diffusion extrusion through the one end that main torsional spring kept away from the telescopic link mutually.
(3) This be based on ecological environmental protection is with planting tree foundation ditch processing apparatus, it is rotatory through the over-and-under type that carries on that does not stop for the inside earth of foundation ditch itself is carrying out the upset that does not stop, carries out adaptation formula adjustment through the accessory plate simultaneously, thereby makes in the foundation ditch earth can further fully carry out the breakage, thereby makes the nutrient in the inside earth of foundation ditch fully to be absorbed by the vegetation.
(4) This be based on ecological environmental protection is with planting tree foundation ditch processing apparatus, restrict main restriction post through main restriction groove, assist the restriction groove and restrict assisting the restriction post, adjust main restriction post through the restriction bearing simultaneously to make when main restriction post goes up and down to move through the slave groove on adjusting the auxiliary rod, the skew can not take place for lift base plate even driving motor itself, thereby reaches guarantee equipment operating stability's effect.
(5) This be based on ecological environmental protection with planting tree foundation ditch processing apparatus, when needs stop the operation to equipment, through external force extrusion accessory plate for the accessory plate removes to being close to telescopic link one side, and at this moment, the sleeve pipe is with restricting the fixture block and replying to corresponding position, moves the movable sleeve through twisting and makes the driving gear drive driven tooth carry out the adaptation formula and adjust, thereby makes restriction ladder piece and restriction draw-in groove correspond, thereby reaches the effect of being convenient for accomplish and reset.
(6) This be based on ecological environmental protection with planting tree foundation ditch processing apparatus, when the accessory plate is opening and shutting the operation, adjust through telescopic link adaptation formula and make restriction adapter sleeve pole carry the sleeve pipe and adjust the restriction inslot portion and the telescopic link remains relative adaptation position throughout to reach the effect of improve equipment stability.
(7) This be based on ecological environmental protection with planting tree foundation ditch processing apparatus carries out supplementary restriction to movable sleeve and driving gear through auxiliary bearing, when the initiative drive shaft drives the telescopic link and rotates, makes movable sleeve and driving gear can not carry out synchronous revolution with the telescopic link through driven tooth restriction and auxiliary bearing cooperation to reach the effect of avoiding the automatic closed condition of accessory plate to take place when the operation.
(8) This be based on ecological environmental protection with planting tree foundation ditch processing apparatus, it is supplementary through the restriction bearing, when main restriction post removes from the inside of moving groove on adjusting the auxiliary rod, through the informal restriction of restriction bearing to main restriction post to make main restriction post carry out the rotation type in the inside from the moving groove and remove, thereby reach the effect of being convenient for adjust.
(9) This be based on ecological environmental protection with planting tree foundation ditch processing apparatus carries out the adaptation with adjusting the restriction groove through the restriction fixture block of great bore, when the accessory plate carries out the adjustment of stretching out and drawing back, restricts at adjusting the restriction inslot portion through the restriction fixture block to reach and avoid leading to the great effect that leads to the unable normal behavior of equipment to take place of accessory plate range of opening and shutting because of unrestricted.
Drawings
FIG. 1 is a schematic view of the overall structure of a tree planting foundation pit treatment device for ecological environment protection;
FIG. 2 is a schematic view showing the internal structure of the equipment cabinet of the present invention;
FIG. 3 is an enlarged view of a portion of the structure at A in FIG. 2 according to the present invention;
FIG. 4 is a side view of a partial structure of the equipment cabinet of the present invention;
FIG. 5 is a partial view showing the structure of an auxiliary plate according to the present invention;
FIG. 6 is an enlarged view of a portion of the structure shown at B in FIG. 5 according to the present invention;
FIG. 7 is an enlarged view of a portion of the structure of FIG. 5 at C in accordance with the present invention;
FIG. 8 is a schematic view of a portion of a driving gear of the present invention;
fig. 9 is a partial structural view of the bushing of the present invention.
In the figure: 1 equipment box, 2 supporting legs, 3 drill cones, 4 limiting plates, 5 auxiliary plates, 6 driving discs, 7 adjusting auxiliary rods, 8 limiting shaft blocks, 9 limiting shaft grooves, 10 driving grooves, 11 driving adjusting blocks, 12 driven grooves, 13 main limiting grooves, 14 auxiliary limiting grooves, 15 lifting base plates, 16 auxiliary limiting columns, 17 lifting grooves, 18 driving motors, 19 driving shafts, 20 movable grooves, 21 limiting bearings, 22 main limiting columns, 23 auxiliary motors, 24 auxiliary driving shafts, 25 limiting base blocks, 26 adapting grooves, 27 adjusting limiting grooves, 28 limiting connecting sleeve rods, 29 sleeve pipes, 30 limiting clamping blocks, 31 driven teeth, 32 movable sleeves, 33 driving gears, 34 fixing shafts, 35 main torsion springs, 36 extrusion grooves, 37 limiting clamping grooves, 38 limiting springs, 39 limiting ladder blocks, 40 auxiliary bearings, 41 times of torsion springs and 42 telescopic rods.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 9, the present invention provides a technical solution: a tree planting foundation pit treatment device based on ecological environmental protection comprises an equipment box 1, wherein the equipment box 1 is in a rectangular box shape, the inside of the equipment box 1 is hollow, supporting legs 2 are fixedly installed at the front end and the rear end of the left side and the rear end of the bottom wall surface of the equipment box 1, the supporting legs 2 are in a rectangular column shape, a drill cone 3 is arranged at the bottom of the equipment box 1, the drill cone 3 is in a cone shape, two groups of limiting plates 4 are fixedly installed at the left end and the right end and the front end and the rear end of the top of the drill cone 3, the limiting plates 4 are in a rectangular plate shape, an auxiliary plate 5 is arranged between the two groups of limiting plates 4 at corresponding positions, the auxiliary plate 5 is in a trapezoid plate shape, the auxiliary plate 5 is gradually widened from bottom to top, a driving disc 6 is arranged on the left side of the inner rear end of the equipment box 1, the driving disc 6 is in a circular block shape, an adjusting auxiliary rod, the limiting shaft block 8 is a circular block, the limiting shaft block 8 is positioned at the front side of the driving disc 6, the position of the limiting shaft block 8 corresponds to the position of the circle center of the driving disc 6, the side wall of the adjusting auxiliary rod 7 is provided with a limiting shaft groove 9, the limiting shaft groove 9 is a circular groove, the size of the limiting shaft groove 9 is matched with the size of the limiting shaft block 8, the rear end of the side wall of the adjusting auxiliary rod 7 is provided with a driving groove 10, the driving groove 10 is a groove hole with semicircular arc-shaped front and rear ends, the edge of the left side wall surface of the driving disc 6 is fixedly provided with a driving adjusting block 11, the driving adjusting block 11 is a circular block, the size of the driving adjusting block 11 is matched with the size of the inner side of the driving groove 10, the driving adjusting block 11 is movably clamped in the driving groove 10 on the adjusting auxiliary rod 7, the front end of the side wall of the adjusting auxiliary rod 7 is provided with, the middle positions of the inner left and right side wall surfaces of the equipment box 1 are both provided with main limiting grooves 13, the main limiting grooves 13 are rectangular slotted holes, the inner left and right side wall surfaces of the equipment box 1 are both provided with two groups of auxiliary limiting grooves 14, the auxiliary limiting grooves 14 are rectangular slotted holes, the two groups of auxiliary limiting grooves 14 on the same side wall in the equipment box 1 are respectively arranged by taking the main limiting grooves 13 as the center in a mutual mirror image manner, the middle position in the equipment box 1 is provided with a lifting base plate 15, the lifting base plate 15 is in a rectangular block shape, the position of the lifting base plate 15 corresponds to the positions of the main limiting grooves 13 and the auxiliary limiting grooves 14, the front and rear ends of the left and right side wall surfaces of the lifting base plate 15 are both fixedly provided with auxiliary limiting columns 16, the auxiliary limiting columns 16 are in a cylindrical block shape, the positions of the auxiliary limiting columns 16 correspond to the positions of the auxiliary limiting grooves 14 on the corresponding position wall surfaces in the inner side of the, the lifting groove 17 is a rectangular groove hole, the position of the lifting groove 17 corresponds to the position of the lifting base plate 15, the bottom of the lifting base plate 15 is fixedly provided with a driving motor 18, the driving motor 18 is a disclosed technology, and is not described herein again, an output shaft of the driving motor 18 is fixedly provided with a driving shaft 19, the driving shaft 19 is a circular column, the center position of the side wall of the lifting base plate 15 is provided with a movable groove 20, the movable groove 20 is a cylindrical groove hole, the position of the movable groove 20 corresponds to the position of the main limiting groove 13, the wall surface of the lifting base plate 15 corresponding to the inner side of the movable groove 20 is fixedly provided with a limiting bearing 21, the limiting bearing 21 is a disclosed technology, and is not described herein again, the inner side wall surface of the inner ring of the limiting bearing 21 is fixedly provided with a main limiting column 22, the size of the main limiting column 22 is matched with the sizes of the main limiting groove 13, the right end of the main limiting column 22 extends to the inside of the main limiting groove 13 at the corresponding position on the right side wall surface inside the equipment box 1, the left end of the main limiting column 22 extends to the inside of the main limiting groove 13 at the corresponding position on the left side wall surface inside the equipment box 1 through the driven groove 12 on the adjusting auxiliary rod 7, the right side area at the rear end inside the equipment box 1 is provided with an auxiliary motor 23, the auxiliary motor 23 is a disclosed technology, which is not described herein in detail, an auxiliary driving shaft 24 is fixedly installed on an output shaft of the auxiliary motor 23, the auxiliary driving shaft 24 is a circular column, one end of the auxiliary driving shaft 24 far away from the auxiliary motor 23 is fixedly installed on the corresponding position wall surface of the driving disc 6, the top wall surface of the drill cone 3 is fixedly installed with a limiting base block 25, the limiting base block 25 is a circular column, a telescopic rod 42 is fixedly installed on the top of the limiting base block, the bottom end of the driving shaft 19 is fixedly mounted on the top wall surface of the telescopic rod 42, the side wall of the auxiliary plate 5 is provided with an adapting groove 26, the size of the adapting groove 26 is adapted to the size of the limiting base block 25, the top of the inner side of the auxiliary plate 5 is provided with an adjusting limiting groove 27, the adjusting limiting groove 27 is a circular groove hole, the side wall of the telescopic rod 42 is fixedly provided with a limiting connecting loop bar 28 corresponding to the adjusting limiting groove 27, the limiting connecting loop bar 28 is a cylindrical rod, the outer side wall of the limiting connecting loop bar 28 is sleeved with a sleeve 29, one end of the sleeve 29 far away from the telescopic rod 42 penetrates through the corresponding position wall surface of the auxiliary plate 5 and extends to the inside of the adjusting limiting groove 27, the inside of the sleeve 29 is provided with a secondary torsion spring 41, the secondary torsion spring 41 is a disclosed technology, the secondary torsion spring 41 is movably connected with the sleeve 29, one end of the sleeve 29 far away from the telescopic rod 42 is fixedly provided with a, the limiting fixture block 30 is in a circular block shape, the size of the limiting fixture block 30 is matched with the size of the inner side of the adjusting limiting groove 27, one end of the sleeve 29, which is far away from the limiting fixture block 30, is provided with a driven tooth 31, the outer side wall of the telescopic rod 42 is sleeved with a movable sleeve 32, the movable sleeve 32 is in a circular tube shape, the inner side of the movable sleeve 32 is fixedly provided with an auxiliary bearing 40, the auxiliary bearing 40 is a disclosed technology, details are not described herein, the inner ring of the auxiliary bearing 40 is fixedly arranged on the wall surface of the outer corresponding position of the telescopic rod 42, the bottom of the movable sleeve 32 is fixedly provided with a driving gear 33, the driving gear 33 is mutually meshed with the driven tooth 31 on the sleeve 29 at the corresponding position, the bottom of the side wall of the auxiliary plate 5 is provided with a circular hole, the fixing shaft 34 is fixedly arranged at the middle position of the side wall surface, which, the inner side of the circular hole on the auxiliary plate 5 is provided with a main torsion spring 35, the main torsion spring 35 is a known technology, details are not described herein, the fixing shaft 34 is movably connected with the auxiliary plate 5 through the main torsion spring 35, the top wall surface of the limiting fixture block 30 is provided with an extrusion groove 36, the extrusion groove 36 is a rectangular groove hole, the top of the auxiliary plate 5 is provided with a limiting clamping groove 37 corresponding to the extrusion groove 36 on the limiting fixture block 30, the limiting clamping groove 37 penetrates through the top wall surface of the auxiliary plate 5 to be communicated with the extrusion groove 36 on the limiting fixture block 30, the bottom of the extrusion groove 36 is fixedly provided with a limiting spring 38, the limiting spring 38 is a known technology, details are not described herein, the top of the limiting spring 38 is fixedly provided with a limiting step 39, the limiting step 39 is a trapezoidal block, and the limiting step 39 gradually widens from one end far away from the telescopic rod 42 to.
The working principle is as follows:
when the auxiliary plate lifting device is used, equipment is placed on a corresponding position, the auxiliary motor 23 in the equipment box 1 is started to drive the driving disc 6 to rotate through the auxiliary driving shaft 24, the driving adjusting block 11 on the driving disc 6 is matched and linked with the driving groove 10 on the adjusting auxiliary rod 7, the adjusting auxiliary rod 7 is enabled to swing and rotate by taking the limiting shaft block 8 as the center, the lifting base plate 15 is driven to lift in the equipment box 1 through the auxiliary limiting of the main limiting column 22, meanwhile, the driving motor 18 is started to drive the telescopic rod 42 through the driving shaft 19, the drill cone 3, the limiting base block 25 and the auxiliary plate 5 rotate, when the driving shaft 19 descends, the drill cone 3 with the auxiliary plate 5 enters soil, when one side, far away from the telescopic rod 42, of the auxiliary plate 5 is extruded by the soil, the auxiliary plate 5 is enabled to move towards one end, close to the telescopic rod 42, through the main torsion spring 35 and the fixing shaft 34 When the auxiliary plate 5 moves towards the end close to the active driving shaft 19, the limiting ladder block 39 inside the auxiliary plate 5 is extruded to be contracted into the extrusion groove 36 through the limiting spring 38, meanwhile, after the limiting ladder block 39 is completely separated from the limiting clamping groove 37, the sleeve 29 drives the limiting clamping block 30 to rotate through the secondary torsion spring 41 to generate reacting force, so that the limiting ladder block 39 is dislocated with the limiting clamping groove 37, at the moment, the auxiliary plate 5 is not limited, so that the auxiliary plate 5 is diffused and extruded through the end, far away from the telescopic rod 42, of the main torsion spring 35, the auxiliary plate 5 is rotated in a lifting mode, the auxiliary plate 5 is matched with the adaptive groove 26 in the side wall of the auxiliary plate 5 to overturn and crush soil, and therefore the operation of processing the soil inside the foundation pit is completed.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.